I'm amazed at how much depth is in this thing. Some demos do a pretty good job at illustrating it's instrumental properties.
The mix knob volume drop isn't a huge problem IMO. When using the Stutter and Judder modes on my BMJ, the mix tends to sound best at 100% wet, which is around unity gain.
The layer mode rewards less extreme mix knob settings though, so pairing it with some kind of volume boost works well.
Even though I'm controlling it with a S.A. Reflex exp pedal at the moment, I can really appreciate the way the sample rate control is emphasized. The chickenhead knob pretty easy to turn with your feet, and it's not far from the footswitches.
It's a ton of fun to latch onto a jittery sample and then slow it down/speed it up with your toes or expression pedal. With programmable expression controllers like the Reflex or 8-Step Program, the amount of possibilities are even greater

For example, you can tailor the sweep to warp between 2 different "delay times" in the layer mode.
Manipulating the rate for longer samples is a lot like fiddling with the playback speed on an old, chirpy, bitcrushy looper. Programmable expression can let you dial in precise double/half-time rates. In a longer "looping" setting (starting very subtly left of 12:00) the chip inside is being pushed beyond it's limits and the sound gradually begins to become littered with chirps, crackles, and other (dare-I-say) lofi

sounds. Further CCW, the chirps grow more obvious until they eventually drown out any semblance of your original sample as the rate approaches fully CCW (10s sample time).
What I like most about the Judder, though, is how well it plays with different kinds of audio sources. A sizable majority of the demos I've seen approach the Judder with a guitar, but I've killed loads of time sending mono drum loops and songs through the Judder from Ableton. With a little skilled tweaking of the sample rate and momentary control, you can create a synchronized, pleasant "skipping" that doesn't sound far from something that an aptly-timed pothole would induce on a well-worn CD.
I don't have anything written down for personal settings, which may be a testament to my familiarity with the pedal and/or complete laziness

The previous owner of mine was kind enough to send a handwritten note with some drawings of his favorite settings. It really isn't too complicated though. When you think of it as 3 different types (modes) of effects, the hardest part is just becoming familiar with how different switch settings will alter the functions of certain knobs.
All praise aside, I'd like possible future versions to:
*Address the mix knob issues
*Allow deeper control of the modulation, which is currently limited to speeds between "jarring" and "smoother-but-hardly-tamable"
*Have access to longer, cleaner sampling, preferably at least 20s
*(A pipe dream, but) Allow expression control of parameters other than sample rate
The latter three would almost certainly raise the price, but I feel they would add to the functionality and versatility of the Judder without turning it into something it isn't.
TLDR; Judder is cool enough to make me blather about it to strangers on the internet